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xprtrdma: Introduce helpers for allocating MWs 

We eventually want to handle allocating MWs one at a time, as
needed, instead of grabbing 64 and throwing them at each RPC in the
pipeline.

Add a helper for grabbing an MW off rb_mws, and a helper for
returning an MW to rb_mws. These will be used in a subsequent patch.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Tested-By: Devesh Sharma <devesh.sharma@avagotech.com>
Reviewed-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2015-05-26 11:52:06 -04:00 committed by Anna Schumaker
parent 89e0d11258
commit 346aa66b2a
2 changed files with 33 additions and 0 deletions
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31
net/sunrpc/xprtrdma/verbs.c
View File

@ -1173,6 +1173,37 @@ rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf)
kfree(buf->rb_pool);
}
struct rpcrdma_mw *
rpcrdma_get_mw(struct rpcrdma_xprt *r_xprt)
{
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
struct rpcrdma_mw *mw = NULL;
unsigned long flags;
spin_lock_irqsave(&buf->rb_lock, flags);
if (!list_empty(&buf->rb_mws)) {
mw = list_first_entry(&buf->rb_mws,
struct rpcrdma_mw, mw_list);
list_del_init(&mw->mw_list);
}
spin_unlock_irqrestore(&buf->rb_lock, flags);
if (!mw)
pr_err("RPC: %s: no MWs available\n", __func__);
return mw;
}
void
rpcrdma_put_mw(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mw *mw)
{
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
unsigned long flags;
spin_lock_irqsave(&buf->rb_lock, flags);
list_add_tail(&mw->mw_list, &buf->rb_mws);
spin_unlock_irqrestore(&buf->rb_lock, flags);
}
/* "*mw" can be NULL when rpcrdma_buffer_get_mrs() fails, leaving
* some req segments uninitialized.
*/

2
net/sunrpc/xprtrdma/xprt_rdma.h
View File

@ -413,6 +413,8 @@ int rpcrdma_ep_post_recv(struct rpcrdma_ia *, struct rpcrdma_ep *,
int rpcrdma_buffer_create(struct rpcrdma_xprt *);
void rpcrdma_buffer_destroy(struct rpcrdma_buffer *);
struct rpcrdma_mw *rpcrdma_get_mw(struct rpcrdma_xprt *);
void rpcrdma_put_mw(struct rpcrdma_xprt *, struct rpcrdma_mw *);
struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *);
void rpcrdma_buffer_put(struct rpcrdma_req *);
void rpcrdma_recv_buffer_get(struct rpcrdma_req *);